Finding the Third Proportional to 622,917 and 978,645

Step by Step Solution

1. Step 1: Write the proportion equation
   622,917 : 978,645 = 978,645 : x
2. Step 2: Convert to fraction form
   622,917/978,645 = 978,645/x
3. Step 3: Cross multiply
   622,917x = 978,645 × 978,645
4. Step 4: Simplify right side
   622,917x = 957,746,036,025
5. Step 5: Solve for x
   x = 957,746,036,025/622,917
6. Step 6: Final answer
   x = 1,537,517.90